<template>
  <div class="nav-bar" :class="{'is_fixes':isFixed}">
      <div class="container">
        <div class="pro-title">
          {{title}}
        </div>
        <div class="pro-param">
          <a href="Javascript:;">概述</a><span>|</span>
          <a href="Javascript:;">参数</a><span>|</span>
          <a href="Javascript:;">用户评价</a>
          <slot name="buy"></slot>
        </div>
      </div>
  </div>
</template>
<script>
export default {
  name:'nav-bar',
  props:{
    title:String
  },
  data() {
    return {
      isFixed:false
    }
  },
  mounted() {
    window.addEventListener('scroll',this.initHeight)
  },
  methods: {
    initHeight(){
      let scrollTop=window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
      this.isFixed =scrollTop>152?true:false;
     
    }
  },
  destroyed() {
    window.removeEventListener('scroll',this.initHeight,false)
    
  },
}
</script>
<style lang="scss">
 @import './../assets/scss/config.scss';
 @import './../assets/scss/mixin.scss';

  .nav-bar{
    height: 70px;
    line-height: 70px;
    border-top: 1px solid $colorH;
    background-color: $colorG;
    z-index: 10;
    
    &.is_fixes{
      position: fixed;
      top: 0;
      width: 100%;
      box-shadow: 0 5px 5px $colorE;
    }
    .container{
      @include flex();
      .pro-title{
        font-size: $fontH;
        color: $colorB;
        font-weight: bold;
      }
      .pro-param{
         font-size: $fontJ;
         span{
           margin: 0 10px;
          
         }
         a{
           color: $colorC;
           
         }
         
      }
    }
  }
</style>

